My son is getting all this backwards. As I mentioned before, he already knows that Darth Vader is Luke Skywalker's father. Now, thanks to this great video he knows what wookiees sound like, and he knows the phrase "Someone move this walking carpet," but he still has not seen Episode IV and says he doesn't want to until he's ten. Years old. He is now four and a half. Sigh.
Added almost three months later: I don't think Leia actually ever says "Someone move this walking carpet." "Someone get this walking carpet out of my way!" is closer, I think.